any compact sedimentary rock composed mainly of clay materials; clay stone.

1785–95; < Latin argill(a) argil + -ite1

argillitic [ahr-juh-lit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
argillite (ˈɑːdʒɪˌlaɪt)
any argillaceous rock, esp a hardened mudstone
[C18: from Latin argilla clay (from Greek argillos) + -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
argillite   (är'jə-līt')  Pronunciation Key 
A highly compacted sedimentary or slightly metamorphic rock consisting primarily of particles of clay or silt. Argillite differs from mudstone in that it does not have the same fine laminations, and from shale and slate in that it is not fissile.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The argillite is marked by few bedding structures and commonly has a near-bedding-parallel cleavage.
Each band of chert is separated from the next by layers of argillite.
Argillite is included with siltstone in the lithology coding.
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